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As old computer hardware becomes harder to maintain, there has been increasing interest in computer simulation. This is especially the case with old [[mainframe computer]]s, which have largely been scrapped, and have space, power, and environmental requirements unaffordable by the average user. The memory size and speed of current systems enable simulation of many old systems to run faster than that system on original hardware.<ref name="Trimble">{{cite journal |last1=Trimble jr |first1=George R. |title=EMULATION of the IBM SYSTEM/360 on a MICROPROGRAMMABLE COMPUTER |journal=MICRO 7: Conference Record of the 7th Annual Workshop on Microprogramming |date=September 1974 |pages=141–150 |doi=10.1145/800118.803854 |s2cid=5984264 |doi-access=free }}</ref><ref name="Burnet">{{cite journal |last1=Burnet |first1=Maxwell M. |last2=Supnik |first2=Robert M. |title=Preserving Computing's Past: Restoration and Simulation |journal=Digital Technical Journal |date=1996 |volume=8 |issue=3 |pages=23–38 |url=http://simh.trailing-edge.com/docs/dtjn02pf.pdf}}</ref>
One popular simulator, the history simulator [[SIMH]], offers simulations for over 50 historic systems, from the 1950s through the present. The [[Hercules (emulator)|Hercules]] emulator simulates the IBM System/360 family from [[System/360]] to 64-bit [[IBM Z|System/z]]. A simulator is available for the [[Honeywell]] [[Multics]] system. An online simulator is available for the [[Altair_8800]] and it runs the actual [[Altair_BASIC]]
Software for older systems was not [[copyright]]ed, and was [[open source]], so there is a wide variety of available software to run on these simulators.
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*[https://www.apress.com/gp/book/9781484241455 Beginning Programming Using Retro Computing]
*[https://www.loadzx.com LOAD ZX Spectrum] Museum, a retro computing museum in Portugal mostly focused on the Sinclair line of computers
*[https://s2js.com/altair/?basic Online MITS Altair] simulated hardware running authentic Altair BASIC
[[Category:Computing culture| ]]
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